They get carbon from the environment
b. They obtain energy from the environment.
c. They make their own food.
d. They provide food for others.
e. They do not need gases to make food.
E
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The structures labeled "D" in the accompanying figure _____
a. prevents movement of materials between cells b. allows passage of a signal to contract heart muscles c. allows the free passage of materials between cells d. is found mostly in stomach tissue e. is found in most tissues except heart muscle
The basic rhythm of the heartbeat is set by the ________
A) systolic pressure B) EKG C) sinoatrial node D) "fight-or-flight" hormone
The increase in girth associated with production of wood and bark in trees occurs as a consequence of
A) primary growth. B) secondary growth. C) apical meristem growth D) indeterminate growth.
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